Color changing device for time indicating label and methods of making and using the same

Inactive Publication Date: 2007-11-13
CCL LABEL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]Thus, the present invention provides a time indicating label which addresses and provides a solution to the problems of the prior art. The labels provide an effective means for determine the safety of frozen foods. The lab

Problems solved by technology

It is well known that food degrades faster at higher temperatures than at lower temperatures, and that the time of exposure to such higher temperatures strongly relates to the degree of degradation resulting from such exposure.
Sell-by dates provide even less indication of the useful life of a foodstuff, since consumers may assume that the foodstuff remains useable for some time period following the se

Method used

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  • Color changing device for time indicating label and methods of making and using the same
  • Color changing device for time indicating label and methods of making and using the same
  • Color changing device for time indicating label and methods of making and using the same

Examples

Experimental program
Comparison scheme
Effect test

example a-1

[0093]Example A-1 provides examples of the preparation of acrylic emulsion pressure sensitive adhesives suitable for use in the present invention.

[0094]The following synthetic protocol was used for the synthesis of an AMMPAS pressure sensitive adhesive (the quantities of monomers used in the following are varied in various samples below, but the procedure is the same):

[0095]Using a mixture of monomers comprising 46.88% by weight iso-octyl acrylate (IOA), 37.5% butyl acrylate (BA), 3.13% MMA (methyl methacrylate), 5.31% acrylic acid (AA), 6.25% 2-acrylamido-2-methyl-l-propanesulfonic acid (AMMPAS), and 0.93% 2,2′-azobisisobutyronitrile (AIBN), an acrylic copolymer was prepared by solution polymerization in a mixture of ethyl acetate and ethanol (weight ratio 36 / 24), using 0.93% by weight (based on the weight of monomers) of AIBN as an initiator. Monomeric AMMPAS was mixed with ethanol (solution A), and the solution A was stirred to get a clear solution. Other monomers and the initiat...

example a-2

[0098]A monomer mixture is made up by mixing 216.3 g. of 2-ethyl hexyl acrylate, 40.76 g of methyl acrylate, 0.32 g. of glycidyl methacrylate, 38.04 g of N-vinyl pyrrolidone and 22.05 g of acrylic acid. A portion of (79.37 g) of this mixture is introduced to a 2-liter reactor equipped with a pitched turbine agitator, a reflux condenser and a thermistor. Also, 34.4 g. of ethyl acetate and 39.4 g of hexane are added to the reactor. The contents of the reactor are heated to reflux and 0.12 g of Vazo 64, are manufactured and sold by DuPont in 5.0 g of ethyl acetate is added. After vigorous reflux started in a short time and the contents of the reactor are held for 5 minutes. At this time, the remaining monomers are mixed with 268.6 g. of ethyl acetate, 37.6 g. of hexane and 0.35 g. of Vazo 64 and are added as a single feed mixture over 3.5 hrs. All through the feed, temperature is maintained to keep reactor contents under reflux. One hour after end of feed, 0.17 g. Vazo 64 is added in 5...

example a-3

[0099]A pressure sensitive adhesive is prepared as described in Example A-2 except isooctyl acrylate is used in place of 2-ethylhexyl acrylate.

[0100]The following Table 2 contains further examples of adhesives. The following examples follow the same procedure of Example A-2. The amount of materials is parts by weight. In the table, NVP refers to N-vinyl pyrrolidone; MeA refers to methyl acrylate; GMA refers to glycidyl methacrylate; AA refers to acrylic acid; and 2-EHA refers to 2-ethylhexyl acrylate.

[0101]

TABLE 2ExampleNVPMeAGMAAA2-EHAA-3 30——3.067.0A-4 1212.80.16.968.2A-5 1212.9—6.968.2A-6 12—0.16.981A-7 1212.60.36.968.2A-8 12—0.36.980.8A-9 1240.36.976.8A-101280.36.972.8A-111212.80.33.671.3A-121212.80.36.968A-131013.60.3769.1A-1410100.3772.7A-1510120.3770.7A-167.916.60.3768.2A-177.916.60.36.968.3A-187.916.90.16.968.2A-197.912.80.3772A-20812.80.33.675.3

[0102]The pressure sensitive adhesives of the present invention exhibit good adhesion to low-energy surfaces. The pressure sensitiv...

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PUM

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Abstract

The present invention relates to the present invention relates to a time indicating label comprising (a) a label substrate having a first and second surface, (b) an acid-base indicator composition, and (c) an activator composition, wherein one of (b) or (c) are on the first surface of the substrate and wherein (b) and (c) when brought in contact remain adhered. The label may have a pressure sensitive adhesive on the second surface of the label. The invention further relates to a method of using the time-temperature indicating label. The labels provide an effective means for determine the safety of frozen foods. The labels also provide a means of providing security by providing name badges that are time sensitive and may not be reused. The name badges provide a means to monitor the length of a visitor's time and prevents reusing the name badge.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority from provisional application No. 60 / 362,471 filed Mar. 7, 2002. The provisional application is hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]This invention relates to time and / or time-temperature indicating labels. More particularly, the time indicating labels include an activator and an acid-base indicator which change color based on time. The invention also relates to the preparation of time and / or time-temperature indicating labels and other devices using such indicating labels.BACKGROUND OF THE INVENTION[0003]Time and / or time-temperature indicating labels may be used in food manufacturing industries to identify food freshness. Time indicating labels may also be used where the label indicates a period of time has expired, such in visitor badge label.[0004]It has long been known to manufacturers and distributors that the shelf life of perishable goods such as foodstuffs is a...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B33/00G01N31/00G04F1/00G01K3/04G01K11/16G09F3/02
CPCG01K3/04G09F3/0291Y10T428/1471Y10T428/14
Inventor KO, CHAN U.LEE, EUNGBANKS, DONALD E.HODSDON, JERRY G.ERCILLO, JESSE C.
Owner CCL LABEL INC
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